Pub Date : 2011-12-29DOI: 10.1109/IMPACT.2011.6117205
Jung-Chang Wang, Tian-Shiang Sung, Wan-Ping Chen
Vapor chamber (VC) has been proven the excellent heat spreading performance utilized particularly in high-power light-emitting diode (LED). As high-power LEDs array are utilized for more general lighting systems, more significant amount of heat flux being generated while it is operating. The main challenge is that the lifetime of high-brightness LEDs is easily shortened by thermal problem generated at the device junction and ambient temperature. The printed circuit board (PCB) composite made up variables of dielectric, copper and solder layer thicknesses affected the thermal performance of high-power LEDs lighting system. Therefore, combination VC and PCB (VCPCB) can perfectly serve the high-power LEDs package system. This study reports the manufacturing characteristics and utilizes experimental analysis with window program VCTM V1.0 to investigate the thermal performance of VCPCB applying in a high-brightness LED array package module. Results show that the effective thermal conductivity of the VCPCB is many times higher than that of the AlN, copper and aluminum PCB, proving that it can effectively reduce the temperature of the LEDs and obtain more uniform illuminance. And the thermal performance of the LEDs VCPCB is better than that of the LEDs Copper PCB and has the highest effective thermal conductivity of 965 W/m°C at 187.5 W/cm2. The LEDs VCPCB works out hot-spot problem of 100 Watt high-power LEDs, successfully.
{"title":"Hyper-generation LEDs VCPCB","authors":"Jung-Chang Wang, Tian-Shiang Sung, Wan-Ping Chen","doi":"10.1109/IMPACT.2011.6117205","DOIUrl":"https://doi.org/10.1109/IMPACT.2011.6117205","url":null,"abstract":"Vapor chamber (VC) has been proven the excellent heat spreading performance utilized particularly in high-power light-emitting diode (LED). As high-power LEDs array are utilized for more general lighting systems, more significant amount of heat flux being generated while it is operating. The main challenge is that the lifetime of high-brightness LEDs is easily shortened by thermal problem generated at the device junction and ambient temperature. The printed circuit board (PCB) composite made up variables of dielectric, copper and solder layer thicknesses affected the thermal performance of high-power LEDs lighting system. Therefore, combination VC and PCB (VCPCB) can perfectly serve the high-power LEDs package system. This study reports the manufacturing characteristics and utilizes experimental analysis with window program VCTM V1.0 to investigate the thermal performance of VCPCB applying in a high-brightness LED array package module. Results show that the effective thermal conductivity of the VCPCB is many times higher than that of the AlN, copper and aluminum PCB, proving that it can effectively reduce the temperature of the LEDs and obtain more uniform illuminance. And the thermal performance of the LEDs VCPCB is better than that of the LEDs Copper PCB and has the highest effective thermal conductivity of 965 W/m°C at 187.5 W/cm2. The LEDs VCPCB works out hot-spot problem of 100 Watt high-power LEDs, successfully.","PeriodicalId":6360,"journal":{"name":"2011 6th International Microsystems, Packaging, Assembly and Circuits Technology Conference (IMPACT)","volume":"2015 1","pages":"332-335"},"PeriodicalIF":0.0,"publicationDate":"2011-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87949636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-12-29DOI: 10.1109/IMPACT.2011.6117180
A. Ostmann, B. Bruehl, D. Manessis, M. Seckel, K. Lang
In coming applications a further increase of diversity and higher complexity of electronic systems is expected. As a consequence it will be an increasingly challenging and time consuming task to design these systems. Although various new components are coming up, the problem of increasing cost for system design, debugging and verification is generally not addressed by conventional technology developments. A new concept to face these challenges will be presented. It is based on the constitution of a system by miniaturised modules, each representing a complete functionality like system control, data storage or sensing. The modules are planar System-in-Packages with embedded active and passive components, having typically 4 contacts on bottom and top. Besides the hardware an integral part of each module is its firmware, a small piece of software which controls a basic functionality, e. g. sensor data filtering and the communication with other modules. The realisation of a Smart Pixel SiP with I²C bus interface and embedded components as well as the design of a modular sensor system will be described. The data communication between modules is also realised by an I²C bus. By combining these modules in different ways, various systems can be realised. The capabilities and challenges of such systems will be discussed.
{"title":"System-in-Packages with embedded components for modular systems","authors":"A. Ostmann, B. Bruehl, D. Manessis, M. Seckel, K. Lang","doi":"10.1109/IMPACT.2011.6117180","DOIUrl":"https://doi.org/10.1109/IMPACT.2011.6117180","url":null,"abstract":"In coming applications a further increase of diversity and higher complexity of electronic systems is expected. As a consequence it will be an increasingly challenging and time consuming task to design these systems. Although various new components are coming up, the problem of increasing cost for system design, debugging and verification is generally not addressed by conventional technology developments. A new concept to face these challenges will be presented. It is based on the constitution of a system by miniaturised modules, each representing a complete functionality like system control, data storage or sensing. The modules are planar System-in-Packages with embedded active and passive components, having typically 4 contacts on bottom and top. Besides the hardware an integral part of each module is its firmware, a small piece of software which controls a basic functionality, e. g. sensor data filtering and the communication with other modules. The realisation of a Smart Pixel SiP with I²C bus interface and embedded components as well as the design of a modular sensor system will be described. The data communication between modules is also realised by an I²C bus. By combining these modules in different ways, various systems can be realised. The capabilities and challenges of such systems will be discussed.","PeriodicalId":6360,"journal":{"name":"2011 6th International Microsystems, Packaging, Assembly and Circuits Technology Conference (IMPACT)","volume":"9 1","pages":"294-297"},"PeriodicalIF":0.0,"publicationDate":"2011-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73365716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-12-29DOI: 10.1109/IMPACT.2011.6117251
Tien-Tsorng Shih, Wei-Chih Chen, Win-Der Lee, Mu-Chun Wang
More high-pin count package and thinner thickness of ball-grid-array (BGA) substrate are appreciated in the recent commercial electronic products. Using thin profile fine-pitch BGA (TFBGA) substrate incorporated into the assembly line is a feasible solution. To expose the possibility with this substrate, two species of lead-free solder balls with and without nickel were applied and the oxygen concentration impacting the solder quality in reflow process was considered. The flux assistance for solderability was adopted to verify the integration capability in assembly mass production. The temperature effect attacking the solder adhesion due to the thermal stress and the difference of thermal expansion coefficients for entire package products was also taken into concern. Using the shear test and drop test could clarify the solder adherence between solder ball and TFBGA carrier substrate. Finally, the Cpk values for all of test groups were greater than 1.33, which demonstrated the TFBGA substrate was suitable to be employed in the high-pin count and high-profit electronic products.
{"title":"Oxygenous reflow affecting performance of Pb-free TFBGA assembly","authors":"Tien-Tsorng Shih, Wei-Chih Chen, Win-Der Lee, Mu-Chun Wang","doi":"10.1109/IMPACT.2011.6117251","DOIUrl":"https://doi.org/10.1109/IMPACT.2011.6117251","url":null,"abstract":"More high-pin count package and thinner thickness of ball-grid-array (BGA) substrate are appreciated in the recent commercial electronic products. Using thin profile fine-pitch BGA (TFBGA) substrate incorporated into the assembly line is a feasible solution. To expose the possibility with this substrate, two species of lead-free solder balls with and without nickel were applied and the oxygen concentration impacting the solder quality in reflow process was considered. The flux assistance for solderability was adopted to verify the integration capability in assembly mass production. The temperature effect attacking the solder adhesion due to the thermal stress and the difference of thermal expansion coefficients for entire package products was also taken into concern. Using the shear test and drop test could clarify the solder adherence between solder ball and TFBGA carrier substrate. Finally, the Cpk values for all of test groups were greater than 1.33, which demonstrated the TFBGA substrate was suitable to be employed in the high-pin count and high-profit electronic products.","PeriodicalId":6360,"journal":{"name":"2011 6th International Microsystems, Packaging, Assembly and Circuits Technology Conference (IMPACT)","volume":"1 1","pages":"443-446"},"PeriodicalIF":0.0,"publicationDate":"2011-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75720511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-12-29DOI: 10.1109/IMPACT.2011.6117255
Jing-Yuan Lin, Yu-Sheng Hsieh, Shang-Chian Su
Infrared light source is a key component in the optical sensing systems especially for the Fourier-Transformed Infrared (FTIR) or different kinds of gas sensor system. This paper proposes a novel method for generating a broadband wavelength infrared light source by MEMS heater based on silicon on insulator (SOI) technology. The enhanced long-tern stability has been achieved by a low electrical resistance SOI wafer. This novel MEMS heater can achieve over than 1000 °C. This MEMS heater could be integrated in micro sensing system such as metal oxide semiconductor and Non-dispersive infrared (NDIR) gas sensors.
{"title":"A high temperature MEMS heater for optical sensors","authors":"Jing-Yuan Lin, Yu-Sheng Hsieh, Shang-Chian Su","doi":"10.1109/IMPACT.2011.6117255","DOIUrl":"https://doi.org/10.1109/IMPACT.2011.6117255","url":null,"abstract":"Infrared light source is a key component in the optical sensing systems especially for the Fourier-Transformed Infrared (FTIR) or different kinds of gas sensor system. This paper proposes a novel method for generating a broadband wavelength infrared light source by MEMS heater based on silicon on insulator (SOI) technology. The enhanced long-tern stability has been achieved by a low electrical resistance SOI wafer. This novel MEMS heater can achieve over than 1000 °C. This MEMS heater could be integrated in micro sensing system such as metal oxide semiconductor and Non-dispersive infrared (NDIR) gas sensors.","PeriodicalId":6360,"journal":{"name":"2011 6th International Microsystems, Packaging, Assembly and Circuits Technology Conference (IMPACT)","volume":"263 1","pages":"451-453"},"PeriodicalIF":0.0,"publicationDate":"2011-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76779429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-12-29DOI: 10.1109/IMPACT.2011.6117263
Chia-Hsun Yeh, Chen-hung Deng, Huei-Huang Lee, Sheng-Jye Hwang, D. Huang
In the IC packaging process, epoxy molding compound (EMC) was filling the mold cavity and cured in the mold. At the same time, adhesion may occur in the interface between the surface of mold and cured EMC. Large adhesion force could cause many problems, which may influence the ejection process. Some other critical problems may also happen in the IC molding process if adhesion problem occurs, such as distortion or crack on ejecting finished parts, residue of cured EMC on the surface of mold affecting the quality of the products, and regular, tedious and not effective mold cleaning. So how to improve the mold adhesion force effectively is an important issue for industry and research institutes. To avoid the mold adhesion problems, improving the mold design and applying suitable surface treatments such as mold surface coating are the common approaches. Among these, applying suitable surface coating is a more popular and practical approach. This study described the approach of using a semi-automatic EMC adhesion force test instrument to measure adhesion force between the mold surface and EMC and studied the corner effect during the encapsulation process. Three different cavity arcs were designed in three specimens and molded and tested during molding to observe the corner effects. Engineers could determine the best type of surface treatment and the type of corner to reduce the amount of mold adhesion force. This paper also discussed the issue of successive adhesion force test and the variation of adhesion force during successive molding test to predict the time for mold cleaning. It was found that larger corner would cause smaller adhesion force. Repeat experiments were executed and found that the test results could be repeated.
{"title":"On mold corner effects of EMC adhesion for IC encapsulation process","authors":"Chia-Hsun Yeh, Chen-hung Deng, Huei-Huang Lee, Sheng-Jye Hwang, D. Huang","doi":"10.1109/IMPACT.2011.6117263","DOIUrl":"https://doi.org/10.1109/IMPACT.2011.6117263","url":null,"abstract":"In the IC packaging process, epoxy molding compound (EMC) was filling the mold cavity and cured in the mold. At the same time, adhesion may occur in the interface between the surface of mold and cured EMC. Large adhesion force could cause many problems, which may influence the ejection process. Some other critical problems may also happen in the IC molding process if adhesion problem occurs, such as distortion or crack on ejecting finished parts, residue of cured EMC on the surface of mold affecting the quality of the products, and regular, tedious and not effective mold cleaning. So how to improve the mold adhesion force effectively is an important issue for industry and research institutes. To avoid the mold adhesion problems, improving the mold design and applying suitable surface treatments such as mold surface coating are the common approaches. Among these, applying suitable surface coating is a more popular and practical approach. This study described the approach of using a semi-automatic EMC adhesion force test instrument to measure adhesion force between the mold surface and EMC and studied the corner effect during the encapsulation process. Three different cavity arcs were designed in three specimens and molded and tested during molding to observe the corner effects. Engineers could determine the best type of surface treatment and the type of corner to reduce the amount of mold adhesion force. This paper also discussed the issue of successive adhesion force test and the variation of adhesion force during successive molding test to predict the time for mold cleaning. It was found that larger corner would cause smaller adhesion force. Repeat experiments were executed and found that the test results could be repeated.","PeriodicalId":6360,"journal":{"name":"2011 6th International Microsystems, Packaging, Assembly and Circuits Technology Conference (IMPACT)","volume":"16 1","pages":"280-283"},"PeriodicalIF":0.0,"publicationDate":"2011-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75259221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-12-29DOI: 10.1109/IMPACT.2011.6117215
Chang-Chun Lee, Y. Shih, C. Wu
A simulation-based prediction of the effective moduli of a silicon interposer with Cu-filled through-silicon via (TSV) is developed to resolve the critical issue of finite element (FE) modeling. The simulation-based prediction in the current study follows the analysis of mechanical reliability urgently considered in large-scale three-dimensional (3D) integrated circuit (IC) packaging. According to the common testing concepts of mechanical properties, finite element analysis (FEA) is systematically performed to obtain the equivalent mechanical properties when different volume fractions of Cu-filled TSV are induced. The proposed simulation methodology is validated and then compared with an analytical model. Results show that the Cu-rich mechanical properties become observable when the TSV pitch is smaller than 25 μm.
{"title":"Effective moduli prediction for silicon interposer with high-density Cu-filled through-silicon via","authors":"Chang-Chun Lee, Y. Shih, C. Wu","doi":"10.1109/IMPACT.2011.6117215","DOIUrl":"https://doi.org/10.1109/IMPACT.2011.6117215","url":null,"abstract":"A simulation-based prediction of the effective moduli of a silicon interposer with Cu-filled through-silicon via (TSV) is developed to resolve the critical issue of finite element (FE) modeling. The simulation-based prediction in the current study follows the analysis of mechanical reliability urgently considered in large-scale three-dimensional (3D) integrated circuit (IC) packaging. According to the common testing concepts of mechanical properties, finite element analysis (FEA) is systematically performed to obtain the equivalent mechanical properties when different volume fractions of Cu-filled TSV are induced. The proposed simulation methodology is validated and then compared with an analytical model. Results show that the Cu-rich mechanical properties become observable when the TSV pitch is smaller than 25 μm.","PeriodicalId":6360,"journal":{"name":"2011 6th International Microsystems, Packaging, Assembly and Circuits Technology Conference (IMPACT)","volume":"1 1","pages":"351-354"},"PeriodicalIF":0.0,"publicationDate":"2011-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75420214","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-12-29DOI: 10.1109/IMPACT.2011.6117178
T. Hofmann, S. Gottschling, B. Schuch, A. Neumann
The future challenges for electronic printed circuit boards in automotive applications is further miniaturization, while increasing reliability and reducing costs. Conventional approaches are limited by the latest circuit substrate requirements. Therefore innovative integration concepts and packaging technologies must be evaluated. For this purpose, Continental has managed VISA, a three-year project funded by the Federal Ministry for Education and Research, where electronic components are embedded into PCBs. The so-called i²Board concept was favourized, developed by Schweizer Electronic AG, in which active and/or passive components are mounted and connected onto an electrical substrate material comparable to a flex foil and already can be functionally tested. Afterwards, the assembly is embedded between the inner layers of the PCB and integrated into the PCB´s set up. Successful developments were conducted with regard to novel ferrite materials for the embedding of inductivities. Also results for bare dies embedded with new connection technologies, e.g. Cu-pillar-bumping for application for transmission control units are outlined
{"title":"International microsystems, packaging, assembly and circuits technology conference (IMPACT 2011): P1. Emerging systems packaging technologies","authors":"T. Hofmann, S. Gottschling, B. Schuch, A. Neumann","doi":"10.1109/IMPACT.2011.6117178","DOIUrl":"https://doi.org/10.1109/IMPACT.2011.6117178","url":null,"abstract":"The future challenges for electronic printed circuit boards in automotive applications is further miniaturization, while increasing reliability and reducing costs. Conventional approaches are limited by the latest circuit substrate requirements. Therefore innovative integration concepts and packaging technologies must be evaluated. For this purpose, Continental has managed VISA, a three-year project funded by the Federal Ministry for Education and Research, where electronic components are embedded into PCBs. The so-called i²Board concept was favourized, developed by Schweizer Electronic AG, in which active and/or passive components are mounted and connected onto an electrical substrate material comparable to a flex foil and already can be functionally tested. Afterwards, the assembly is embedded between the inner layers of the PCB and integrated into the PCB´s set up. Successful developments were conducted with regard to novel ferrite materials for the embedding of inductivities. Also results for bare dies embedded with new connection technologies, e.g. Cu-pillar-bumping for application for transmission control units are outlined","PeriodicalId":6360,"journal":{"name":"2011 6th International Microsystems, Packaging, Assembly and Circuits Technology Conference (IMPACT)","volume":"15 1","pages":"291-293"},"PeriodicalIF":0.0,"publicationDate":"2011-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80631083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-12-29DOI: 10.1109/IMPACT.2011.6117250
Tien-Tsorng Shih, Wei-Chih Chen, Win-Der Lee, Mu-Chun Wang
Due to the technology improvement of ball-grid-array (BGA) package, the high-pin count concept was derived to the mass production. The low profile fine pitch BGA (LFBGA) package was employed to gain the assembly competition. The smaller diameter of solder ball, 0.3 mm, must be incorporated and the composition of solder ball needs to be modified such as including nickel to strengthen the adhesion capability in IMC layer. Since the oxygen concentration in flow process usually works upon the quality of solder joint such as oxidation causing aged effect and quality of inter-metal compound, the oxygen variance is checked in this study. Furthermore, the flux as solder assistance is also a cardinal factor affecting the solder adherence between LFBGA substrate and solder ball. Adopting the temperature cycling test, shear test and drop test to understand the adhesion ability for lead-free solder balls on LFBGA substrate assisted with several fluxes, the optimal process recipe was obtained. The soldering performance was promoted well.
{"title":"Nickel solder ball performance for Pb-free LFBGA assembly under oxygenous reflow","authors":"Tien-Tsorng Shih, Wei-Chih Chen, Win-Der Lee, Mu-Chun Wang","doi":"10.1109/IMPACT.2011.6117250","DOIUrl":"https://doi.org/10.1109/IMPACT.2011.6117250","url":null,"abstract":"Due to the technology improvement of ball-grid-array (BGA) package, the high-pin count concept was derived to the mass production. The low profile fine pitch BGA (LFBGA) package was employed to gain the assembly competition. The smaller diameter of solder ball, 0.3 mm, must be incorporated and the composition of solder ball needs to be modified such as including nickel to strengthen the adhesion capability in IMC layer. Since the oxygen concentration in flow process usually works upon the quality of solder joint such as oxidation causing aged effect and quality of inter-metal compound, the oxygen variance is checked in this study. Furthermore, the flux as solder assistance is also a cardinal factor affecting the solder adherence between LFBGA substrate and solder ball. Adopting the temperature cycling test, shear test and drop test to understand the adhesion ability for lead-free solder balls on LFBGA substrate assisted with several fluxes, the optimal process recipe was obtained. The soldering performance was promoted well.","PeriodicalId":6360,"journal":{"name":"2011 6th International Microsystems, Packaging, Assembly and Circuits Technology Conference (IMPACT)","volume":"10 1","pages":"439-442"},"PeriodicalIF":0.0,"publicationDate":"2011-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84407575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-12-29DOI: 10.1109/IMPACT.2011.6117262
Jardar Yang, Hi Huang
The aim of this project is to develop an alternative material for bumps of LCD driver ICs and to establish a feasible packaging process for the alternative material. With the continuously escalating price of gold, an alternative material to replace the widely used gold bumps in LCD driver IC packaging is eagerly demanded. Therefore, copper bumps are selected for evaluation in this study. To comply with the oxidation-prone and higher hardness characteristics of Cu bumps, nonconductive paste (NCP) resin and ultrasonic bonding are introduced as well in the packaging process. Compared with the commonly used thermo compression bonding technology for Au-bumped LCD driver IC packaging, the ultrasonic bonding method with NCP resin employs relatively lower temperature and bonding force. In the feasibility evaluation of the Cu bumps, the objective is to achieve a bonding reliability and adhesion quality similar to or even better than that of Au bumps under thermo compression bonding. In the experiment, fine tuning of some operative parameters was executed in order to get the positive results. These operative factors include the following: (a) NCP resin viscosity, (b) NCP resin dispense pattern, (c) dispense temperatures, (d) bonding sequence, (e) bonding temperature, (f) ultrasonic power, (g) bonding force, and (h) bonding time, which play key roles in the study.
{"title":"Feasibility study for copper bump with tin plating bonding by using NCP adhesive and ultrasonic bonding technique","authors":"Jardar Yang, Hi Huang","doi":"10.1109/IMPACT.2011.6117262","DOIUrl":"https://doi.org/10.1109/IMPACT.2011.6117262","url":null,"abstract":"The aim of this project is to develop an alternative material for bumps of LCD driver ICs and to establish a feasible packaging process for the alternative material. With the continuously escalating price of gold, an alternative material to replace the widely used gold bumps in LCD driver IC packaging is eagerly demanded. Therefore, copper bumps are selected for evaluation in this study. To comply with the oxidation-prone and higher hardness characteristics of Cu bumps, nonconductive paste (NCP) resin and ultrasonic bonding are introduced as well in the packaging process. Compared with the commonly used thermo compression bonding technology for Au-bumped LCD driver IC packaging, the ultrasonic bonding method with NCP resin employs relatively lower temperature and bonding force. In the feasibility evaluation of the Cu bumps, the objective is to achieve a bonding reliability and adhesion quality similar to or even better than that of Au bumps under thermo compression bonding. In the experiment, fine tuning of some operative parameters was executed in order to get the positive results. These operative factors include the following: (a) NCP resin viscosity, (b) NCP resin dispense pattern, (c) dispense temperatures, (d) bonding sequence, (e) bonding temperature, (f) ultrasonic power, (g) bonding force, and (h) bonding time, which play key roles in the study.","PeriodicalId":6360,"journal":{"name":"2011 6th International Microsystems, Packaging, Assembly and Circuits Technology Conference (IMPACT)","volume":"100 1","pages":"284-286"},"PeriodicalIF":0.0,"publicationDate":"2011-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80989698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-12-29DOI: 10.1109/IMPACT.2011.6117240
H. Chien, J. Lau, Y. Chao, R. Tain, M. Dai, W. Lo, M. Kao
In this study, thermal performance of 3D IC integration is investigated. Emphasis is placed on the determination of a set of equivalent thermal conductivity equations for Cu-filled TSVs with various TSV diameters, TSV pitches, TSV thicknesses, passivation thicknesses, and microbump pads. Also, a slice model to imitate a 3D memory stacked chip is adopted to verify the accuracy of the equivalent equations. Finally, the feasibility of these equivalent equations is demonstrated through a simple 3D IC integration structure.
{"title":"Estimation for equivalent thermal conductivity of silicon-through vias TSVs used for 3D IC integration","authors":"H. Chien, J. Lau, Y. Chao, R. Tain, M. Dai, W. Lo, M. Kao","doi":"10.1109/IMPACT.2011.6117240","DOIUrl":"https://doi.org/10.1109/IMPACT.2011.6117240","url":null,"abstract":"In this study, thermal performance of 3D IC integration is investigated. Emphasis is placed on the determination of a set of equivalent thermal conductivity equations for Cu-filled TSVs with various TSV diameters, TSV pitches, TSV thicknesses, passivation thicknesses, and microbump pads. Also, a slice model to imitate a 3D memory stacked chip is adopted to verify the accuracy of the equivalent equations. Finally, the feasibility of these equivalent equations is demonstrated through a simple 3D IC integration structure.","PeriodicalId":6360,"journal":{"name":"2011 6th International Microsystems, Packaging, Assembly and Circuits Technology Conference (IMPACT)","volume":"77 1","pages":"153-156"},"PeriodicalIF":0.0,"publicationDate":"2011-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83341340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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